flying opossum vs phalanger

flying opossum and phalanger both are nouns.

Word	Noun	Adjective	Verb	Adverb
flying opossum	Yes	No	No	No
phalanger	Yes	No	No	No

As nouns, phalanger is a hypernym of flying opossum; that is, phalanger is a word with a broader meaning than flying opossum:

flying opossum: nocturnal phalangers that move with gliding leaps using parachute-like folds of skin along the sides of the body
phalanger: small furry Australian arboreal marsupials having long usually prehensile tails

Other hypernyms of flying opossum include opossum, possum.

flying opossum (noun)	phalanger (noun)
nocturnal phalangers that move with gliding leaps using parachute-like folds of skin along the sides of the body	small furry Australian arboreal marsupials having long usually prehensile tails